SOLUTION: Fifteen less than the square of a number is the same as twice the number. find the number(s).

SOLUTION: Fifteen less than the square of a number is the same as twice the number. find the number(s).

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Question 264276: Fifteen less than the square of a number is the same as twice the number. find the number(s).
Answer by Ruli(21) (Show Source): You can put this solution on YOUR website!
15 less than the square of a number x^-15
is the same as twice the number = 2x
x^-15 = 2x
x^-2x-15
(x-5)(x+3)
x = 5 or x =-3
check:
1)5^-15 = 2(5)
25-15 = 10
10 = 10
or
2)-3^-15 = 2(-3)
9-15 = -6
-6 = -6
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